add proper minimum bpfloader version annotations for block/clatd/dscp_policy/netd
In practice this doesn't actually really matter, since older versions
of the bpfloader won't even look in the relevant directories:
BpfLoader v0.9 is the first one that looks into
'/apex/com.android.tethering/etc/bpf/net_shared',
but it is only v0.12 that pins the resulting programs and maps
correctly into
/sys/fs/bpf/net_shared/
hence the annotations for block/clatd/dscp_policy.
BpfLoader v0.13 is the first one that looks into
'/apex/com.android.tethering/etc/bpf/netd_shared'
subdirectory and pins into
/sys/fs/bpf/netd_shared/
hence the annotation for netd.
But it's best to explicitly document the intent.
Note that in practice the mainline module will fail spectacularly
on a T OS if it can't find the programs and maps
(presumably due to the bpfloader being too old)
but will work on S even though the bpfloader there is much older,
because these programs/maps are not required on pre-T OS.
This change is thus really only documentation.
Bug: 218408035
Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I5ffa2faf83ca337b84e34b01df84436629989c58
diff --git a/bpf_progs/clatd.c b/bpf_progs/clatd.c
index 9a9d337..87795f5 100644
--- a/bpf_progs/clatd.c
+++ b/bpf_progs/clatd.c
@@ -30,6 +30,9 @@
#define __kernel_udphdr udphdr
#include <linux/udp.h>
+// The resulting .o needs to load on the Android T bpfloader v0.12+
+#define BPFLOADER_MIN_VER 12u
+
#include "bpf_helpers.h"
#include "bpf_net_helpers.h"
#include "bpf_shared.h"